Question 1

What is a webhook tester and why do I need one?

Accepted Answer

A webhook tester generates temporary HTTP endpoints that receive and capture webhook requests from external services. This lets you inspect payloads, verify signatures, debug integration issues, and test webhook handling before deploying to production. It's essential for developing reliable webhook integrations with services like Stripe, GitHub, Shopify, and Twilio.

Question 2

How does the webhook inspector work?

Accepted Answer

When you create a test endpoint, our tool generates a unique URL that captures any incoming HTTP requests. Each request is stored temporarily, showing the complete payload (headers, body, query parameters), timestamp, and signature verification status. You can inspect raw JSON, formatted data, and all HTTP headers to understand exactly what the service is sending.

Question 3

Which webhook providers are supported for signature validation?

Accepted Answer

This tool supports signature validation for GitHub (HMAC-SHA256), Stripe (HMAC-SHA256 with timestamp), Shopify (HMAC-SHA256), Twilio (HMAC-SHA1), Slack (HMAC-SHA256), SendGrid (webhook signature verification), Discord (Ed25519), and Mailgun (HMAC-SHA256). Each provider uses different signature algorithms and header formats, which the tool automatically detects and validates.

Question 4

How long are webhook requests stored?

Accepted Answer

Captured webhook requests are stored temporarily for 24 hours, after which they are automatically deleted. For privacy and security, we recommend using test/sandbox mode from webhook providers rather than sending production data. You can manually clear captured requests at any time using the "Clear All" button.

Question 5

Can I filter or search captured webhook requests?

Accepted Answer

Yes! The inspector includes powerful filtering options: filter by event type (e.g., "payment.succeeded"), filter by HTTP status code, filter by signature validation status (valid/invalid/missing), search payloads by text or JSON path, and sort by timestamp. This makes it easy to find specific webhooks when testing complex integrations.

Question 6

How do I test webhook signature verification?

Accepted Answer

After configuring a webhook in your service provider (Stripe, GitHub, etc.), paste your webhook secret into the tool. When webhooks arrive, the inspector will automatically validate signatures using the provider's algorithm and display whether verification passed or failed. This helps ensure your production code is correctly validating signatures to prevent spoofing attacks.

Question 7

Can I replay captured webhooks?

Accepted Answer

Yes! Each captured webhook has a "Replay" button that resends the exact same payload to a different endpoint of your choice. This is incredibly useful for: testing your webhook handler multiple times, debugging without waiting for real events, developing locally without exposing your machine, and creating reproducible test cases for edge cases.

Question 8

Is this tool secure for testing production webhooks?

Accepted Answer

While the tool uses HTTPS encryption and temporary storage, we strongly recommend using test/sandbox mode from your webhook providers rather than sending production data. Many services like Stripe and Shopify have test environments that send realistic webhooks without involving real customers or transactions. This protects sensitive business data while providing complete testing capabilities.

Question 9

How can I test webhooks during local development?

Accepted Answer

Use the generated test endpoint as your webhook URL during development. Point your service provider (Stripe, GitHub, etc.) to this endpoint instead of your local machine. Inspect incoming webhooks in the browser, then use the replay function to send them to your localhost development server (using ngrok or similar tunneling if needed). This workflow eliminates the need to constantly re-trigger events.

Question 10

What should I do if webhook signatures keep failing validation?

Accepted Answer

Common signature validation failures occur due to: (1) Incorrect webhook secret - verify you copied the right secret from provider settings, (2) Wrong environment - using production secret with test webhooks or vice versa, (3) Timestamp issues - some providers include timestamps that expire, (4) Payload modification - even whitespace changes invalidate signatures, (5) Header case sensitivity - check exact header name formatting. The inspector shows detailed error messages to help diagnose each case.

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